# DSA-5999-1: libjson-xs-perl security update

DSA-5999-1, released September 11, 2025, fixes 1 CVE in libjson-xs-perl. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/dsa-5999-1
- Platform: Linux
- Released: Sep 11, 2025
- Priority: High (Closes CVE-2025-40928, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://security-tracker.debian.org/tracker/CVE-2025-40928

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libjson-xs-perl](https://patchblox.com/security/data/product/linux/libjson-xs-perl.md) | Debian 12.15 (bookworm) | 4.040-1~deb12u1 |
| [libjson-xs-perl](https://patchblox.com/security/data/product/linux/libjson-xs-perl.md) | Debian 13.5 (trixie) | 4.040-1~deb13u1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-40928](https://patchblox.com/security/data/cve/CVE-2025-40928.md) | High | JSON::XS before version 4.04 for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact | 7.5 | 0.0067 |  |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo